1557
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Ran 08 Jan 2016 09:50AM UTC

Jobs 1

Files 62

Run time 2s

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Build # 1557

Build Type

push

travis-ci

Committed by

ben-manes

Commit Message

Remove ConcurrentLinkedStack; schedule SingleConsumerQueue for removal

These data structures were written as initial seeds for this project
and do not fit into the theme in the public API. Instead users should
look to JCTools which is focused specifically on specialized concurrent
data structures.

ConcurrentLinkedStack is unused, marked @Beta, and was never matured to
be promoted into a completed API. The `@Beta` opts it out of semvar
rules, allowing it to be deleted in a minor release. The stack uses a
backoff arena to efficiently eliminate and combine operations.

SingleConsumerQueue was promoted due to being used by the cache as the
write buffer. It uses a backoff arena to more efficently handle producer
contention by batching updates to the queue. This was to avoid the
write buffer from being a write hotspot, though profiling indicates
the hash table / entry synchronization dominate. JCTools offers a
MpscLinkedQueue as an alternative to this class. Due to semvar, SCQ
is scheduled for removal in the next major release (3.0.0). This will
also allow us to revisit the design, perhaps prefering a growable
array queue to be more GC friendly.

Benchmarks were improved based on the excellent advise in #46.

Coverage Stats

4064 of 4318 relevant lines covered (94.12%)

0.94 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	1557.1 (TERM=dumb)	08 Jan 2016 09:50AM UTC	0	94.12	Travis Job 1557.1

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